Theory Of Operation
WARNING: This page is about a different car, the 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This message is used by the Powertrain Control Module (PCM) for Electronic Range Select (ERS) operation. The ERS switch is hard wired to the Body Control Module (BCM). The BCM then sends a CAN bus message to the PCM.